Look at your phone's screen while in Download Mode. Locate the line that says or B: (numbers) . For example, B:4 means your device is on Binary 4.
A: Because TWRP is a custom (non-Samsung) binary. Your phone's bootloader security (OEM lock, FRP lock, or RMM state) is specifically designed to block such unauthorized images.
Download and re-install the official to ensure your PC communicates cleanly via the correct protocols. Ultimate Solution: Flash with the Standard CSC File odin rqtclose
Do not use the oldest version of Odin you can find.
ODIN often uses (managed nodes with states: Unconfigured, Inactive, Active, Finalized). If you send a Shutdown or Cleanup transition via an rqt plugin (like rqt_lifecycle_manager ), the ODIN node will call its on_shutdown() callback and exit. Look at your phone's screen while in Download Mode
Are you using this within a (like a GitHub repo)?
if (diagnostic_pub_->get_subscription_count() > 0) diagnostic_pub_->publish(diagnostic_msg); A: Because TWRP is a custom (non-Samsung) binary
If your computer cannot properly interpret the data coming from the phone, it drops the connection.